Electrical Machines-1 (JNTUK Syllabus)

Introduction to DC machines
Construction and principle of operation of DC machine – emf equation for generator – classification of DC machines based on excitation – OCC of DC shunt generator – applications of DC Generators

Performance of DC Machines
Torque and back- emf equations of dc motors – Armature reaction and commutation – characteristics of separately-excited, shunt, series and compound motors – losses and efficiency– applications of dc motors.

Starting, Speed Control and Testing of DC Machines
Necessity of a starter – starting by 3 point and 4 point starters – speed control by armature voltage and field control. Testing of DC machines – brake test, Swinburne’s method – principle of regenerative or Hopkinson’s method – retardation test – separation of losses.

Single-phase Transformers
Types and constructional details – principle of operation – emf equation – operation on no load and on load –phasor diagrams of transformers - equivalent circuit – regulation – losses and efficiency – effect of variation of frequency and supply voltage on losses – all day efficiency.

Testing of Transformers and 3-Phase Transformers
Tests on single phase transformers – open circuit and short circuit tests – Sumpner’s test – separation of losses- parallel operation with equal voltage ratios – auto transformer –comparison with two winding transformers. Polyphase connections - Y/Y, Y/∆, ∆/Y, ∆/∆ and open ∆, - Third harmonics in phase voltages
- three winding transformers: determination of Zp, Zs and Zt -- transients in switching - off load and on load tap changers -- Scott connection.

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